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0x0A. C - argc, argv

Learning objectives for this project:

  • How to use arguments passed to your program
  • What are two prototypes of main that you know of, and in which case do you use one or the other
  • How to use __attribute__((unused)) or (void) to compile functions with unused variables or parameters

Tasks 📃

  • 0. It ain't what they call you, it's what you answer to

    • 0-whatsmyname.c: C program that prints its name, followed by a new line.
      • If you rename the program, it will print the new name, without having to compile again
      • You should not remove the path before the name of the program

  • 1. Silence is argument carried out by other means

    • 1-args.c: C program that prints the number of arguments passed into it, followed by a new line.

  • 2. The best argument against democracy is a five-minute conversation with the average voter

    • 2-args.c: C program that prints all the arguments it receives.
      • All arguments are printed, including the first one.
      • One argument per line.

  • 3. Neither irony nor sarcasm is argument

    • 3-mul.c: C program that multiplies two numbers.
      • Prints the result followed by a new line
      • Assume two numbers and result are stored as integers
      • Print Error and return 1 if program does not receive two arguments

  • 4. To infinity and beyond

    • 4-add.c: C program that adds two positive numbers and prints the result, followed by a new line.
      • The program assumes that the numbers and result of the addition can be stored in an int.
      • If no number is passed to the program, it prints 0 followed by a new line.
      • If one of the numbers contains symbols that are not digits, the program prints Error followed by a new line and returns 1.

  • 5. Minimal Number of Coins for Change

    • 100-change.c: C program that prints the minimum number of coins to make change for an amount of money.
      • Usage: ./change cents where cents is the amount of cents needed to give back.
      • Change can use an unlimited number of coins of values 25, 10, 5, 2 and 1 cent.
      • If the number passed as the argument is negative, the program prints 0 followed by a new line.
      • If the number of arguments passed to the program is not exactly one, it prints Error followed by a new line and returns 1.